I could see DLNA in smartphone communication (COMMS) spec section for few phones like Nexus 6, Pixel 1, 2, 3 but, not for iPhones in gsmarena.com
https://www.gsmarena.com/compare.php3?idPhone1=9350&idPhone2=9256&idPhone3=8858
What difference it makes if a phone doesn't support DLNA?